CN105979637A - Corrugation canceling circuit based city power overvoltage protection system for LEDs - Google Patents
Corrugation canceling circuit based city power overvoltage protection system for LEDs Download PDFInfo
- Publication number
- CN105979637A CN105979637A CN201610430392.4A CN201610430392A CN105979637A CN 105979637 A CN105979637 A CN 105979637A CN 201610430392 A CN201610430392 A CN 201610430392A CN 105979637 A CN105979637 A CN 105979637A
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- Prior art keywords
- pole
- circuit
- audion
- electric capacity
- diode
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a corrugation canceling circuit based city power overvoltage protection system for LEDs. The corrugation canceling circuit based city power overvoltage protection system is characterized by mainly consisting of a transformer T, a control chip U3, a three-terminal voltage-stabilizing chip U2, a switch circuit, a resistor R4, a rectification filter circuit, a trigger circuit, a corrugation voltage canceling circuit, a diode D4 and the like, wherein the switch circuit is connected with an OUT pin of the control chip U3; the resistor R4 is serially connected between a CONT pin of the control chip U3 and the switch circuit; the rectification filter circuit is connected with the transformer T; the trigger circuit is connected with the rectification filter circuit; the corrugation voltage canceling circuit is connected with a TRIG pin of the control chip U3; and a P pole of the diode D4 is connected with the trigger circuit, and an N pole of the diode D4 is connected with the corrugation voltage canceling circuit. According to the system, residual corrugation voltage can be cancelled, so that the stability of the system is improved, and the system is prevented from generating false operation.
Description
Technical field
The present invention relates to a kind of overvoltage protective system, specifically refer to a kind of LED use eliminating circuit based on ripple
Mains supply over-voltage protection system.
Background technology
At present, due to LED have that energy consumption is low, the feature such as length in service life and safety and environmental protection, it is
Become one of main product of people's life lighting.Employing overvoltage protection system is typically required when LED operation
It is protected by system, it is to avoid LED is damaged by overvoltage produced by power network fluctuation.But, current institute
The sensitivity of the overvoltage protective system used is relatively low, it is impossible to when overvoltage produces, LED is carried out by the very first time
Protection, it is impossible to meet the requirement of people.
Summary of the invention
It is an object of the invention to the defect overcoming traditional overvoltage protective system sensitivity relatively low, it is provided that a kind of
The LED mains supply over-voltage eliminating circuit based on ripple protects system.
The purpose of the present invention is achieved through the following technical solutions: a kind of LED city eliminating circuit based on ripple
Electricity overvoltage protective system, mainly by transformator T, control chip U3, three-terminal voltage-stabilizing chip U2, with control core
The on-off circuit that the OUT pin of sheet U3 is connected, is serially connected in the CONT pin of control chip U3 and opens
Closing the resistance R4 between circuit, the current rectifying and wave filtering circuit being connected with transformator T-phase, with current rectifying and wave filtering circuit phase
The triggering circuit connected, the ripple voltage being connected with the TRIG pin of control chip U3 eliminates circuit, P
Pole is connected with triggering circuit, N pole then eliminates, with ripple voltage, the diode D4, Yi Jizheng that circuit is connected
Pole is connected with the colelctor electrode of audion VT3, negative pole is managed with the THRE of control chip U3 after resistance R3
The electric capacity C4 composition that foot is connected；The IN pin of described three-terminal voltage-stabilizing chip U2 with trigger circuit be connected,
Its OUT pin is connected with RE pin and the VCC pin of control chip U3 the most respectively, its GND pipe
Foot ground connection.
Further, described ripple voltage eliminates electricity routing amplifier P1, amplifier P2, audion VT4,
Negative pole negative pole with amplifier P2 after electric capacity C8 is connected, positive pole then eliminates circuit as this ripple voltage
The electric capacity C6 of input, one end negative pole with amplifier P1 after resistance R9 is connected, the other end then with
The resistance R7 that the positive pole of electric capacity C6 is connected, positive pole is connected with the junction point of resistance R7 and resistance R9,
The negative pole phase of electric capacity C7, the N pole that negative pole negative pole with electric capacity C6 after resistance R8 is connected and electric capacity C7
Connect, diode D6 that P pole then positive pole with amplifier P2 is connected, the negative pole of positive pole and amplifier P1
Be connected, electric capacity C9 that negative pole then negative pole with amplifier P2 is connected, be serially connected in the positive pole of amplifier P1
And the resistance R10 between outfan, it is serially connected in the resistance R11 between positive pole and the outfan of amplifier P2,
And the resistance R12 composition being serially connected between the outfan of amplifier P1 and the colelctor electrode of audion VT4；
The minus earth of described amplifier P2, its outfan then base stage with audion VT4 is connected；Described three poles
The grounded emitter of pipe VT4；The outfan of described amplifier P1 eliminates the output of circuit as this ripple voltage
End is also connected with the TRIG pin of control chip U3；Described ripple voltage eliminate circuit input then with
The N pole of diode D4 is connected.
Described current rectifying and wave filtering circuit is made up of diode rectifier U1 and electric capacity C1；Described diode rectifier
The cathode output end of U1 is connected with the negative pole of electric capacity C1, its cathode output end then with the positive pole phase of electric capacity C1
Connect；The input of described diode rectifier U1 then with the Same Name of Ends of the secondary inductance coil of transformator T and
Non-same polarity is connected, its cathode output end also non-same polarity with the former limit inductance coil of transformator T is connected
Connect；The positive pole of described electric capacity C1 is all connected with triggering circuit with negative pole.
Described triggering circuit is by audion VT1, audion VT2, audion VT3, N pole and electric capacity C1
The diode D1 that negative pole is connected, P pole then emitter stage with audion VT1 is connected, positive pole and three poles
The electric capacity C2 that the emitter stage of pipe VT1 is connected, negative pole then base stage with audion VT3 is connected, concatenation
Resistance R1 between the emitter stage and the base stage of audion VT3 of audion VT2, positive pole and audion VT3
Electric capacity C3, the P pole that emitter stage is connected, negative pole is then connected with the N pole of diode D1 and audion
The diode D3 that the colelctor electrode of VT2 is connected, N pole then colelctor electrode with audion VT3 is connected,
The diode that N pole is connected with the positive pole of electric capacity C1, P pole then colelctor electrode with audion VT2 is connected
D2, and the resistance R2 composition being serially connected between the N pole of diode D2 and the N pole of diode D3；Institute
The IN pin stating three-terminal voltage-stabilizing chip U2 is then connected with the N pole of diode D2；Described audion VT1
Base stage be connected with the positive pole of electric capacity C1, its colelctor electrode then base stage with audion VT2 is connected；Institute
The N pole of the GND pin and diode D1 of stating control chip U3 is connected；The N of described diode D1
Pole CONT pin with control chip U3 after resistance R4 is connected；The current collection of described audion VT3
Pole is connected with the N pole of diode D4 and the positive pole of electric capacity C4 the most respectively.
Described on-off circuit, by bidirectional thyristor D5, is serially connected in the control pole of bidirectional thyristor D5 and controls core
Resistance R5 between the OUT pin of sheet U3, positive pole is connected with the second plate of bidirectional thyristor D5,
Negative pole be then connected with the N pole of diode D1 while the electric capacity C5 of ground connection, and one end and two-way brilliant lock
The first anode of pipe D5 is connected, the other end then Same Name of Ends with the former limit inductance coil of transformator T is connected
Resistance R6 composition.
Described control chip U3 is the integrated chip of NE555, and three-terminal voltage-stabilizing chip U2 is 7815 integrated chips.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) present invention uses the integrated chip of NE555 and corresponding peripheral circuit to combine, and utilizes cleverly
The switching function of transistor, makes present invention sensitivity enhancement 30% compared with traditional overvoltage protective system,
Such that it is able to effectively LED is carried out overvoltage protection.
(2) present invention can cut off the electricity supply when line voltage exceedes higher limit and make LED not work, and works as electricity
Net voltage recloses power supply when recovering normal makes LED again light, such that it is able to protection LED is not by the most electric
Crushing is bad.
(3) remaining ripple voltage can be eliminated by the present invention, thus improves the stability of the present invention,
The present invention is avoided to produce misoperation.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the ripple voltage elimination circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by transformator T, control chip U3, three-terminal voltage-stabilizing chip U2, with
The on-off circuit that the OUT pin of control chip U3 is connected, is serially connected in the CONT pipe of control chip U3
Resistance R4 between foot and on-off circuit, the current rectifying and wave filtering circuit being connected with transformator T-phase, with rectifying and wave-filtering
The triggering circuit that circuit is connected, the ripple voltage being connected with the TRIG pin of control chip U3 eliminates electricity
Road, P pole is connected with triggering circuit, N pole then eliminates, with ripple voltage, the diode D4 that circuit is connected,
And positive pole is connected with the colelctor electrode of audion VT3, negative pole after resistance R3 with control chip U3's
The electric capacity C4 composition that THRE pin is connected；The IN pin of described three-terminal voltage-stabilizing chip U2 and triggering circuit
Be connected, its OUT pin is connected with RE pin and the VCC pin of control chip U3 the most respectively, it
GND pin ground connection.In order to preferably implement the present invention, the described control chip U3 integrated core of preferred NE555
Sheet, the integrated chip of three-terminal voltage-stabilizing chip U2 the most preferably 7815 realizes.
Wherein, this current rectifying and wave filtering circuit is made up of diode rectifier U1 and electric capacity C1.Described diode is whole
The cathode output end of stream device U1 is connected with the negative pole of electric capacity C1, its cathode output end is then with electric capacity C1's
Positive pole is connected.The input of described diode rectifier U1 then same with the secondary inductance coil of transformator T
Name end is connected with non-same polarity, its cathode output end also non-of the same name with the former limit inductance coil of transformator T
End is connected.The positive pole of described electric capacity C1 is all connected with triggering circuit with negative pole.
It addition, described triggering circuit is by audion VT1, audion VT2, audion VT3, resistance R1,
Resistance R2, diode D1, diode D2, diode D3, electric capacity C2 and electric capacity C3 form.
During connection, the N pole of diode D1 is connected with the negative pole of electric capacity C1, its P pole then with audion
The emitter stage of VT1 is connected.The positive pole of electric capacity C2 is connected with the emitter stage of audion VT1, its negative pole
Then the base stage with audion VT3 is connected.Resistance R1 is serially connected in emitter stage and the audion of audion VT2
Between the base stage of VT3.The positive pole of electric capacity C3 is connected with the emitter stage of audion VT3, its negative pole then with
The N pole of diode D1 is connected.The P pole of diode D3 is connected with the colelctor electrode of audion VT2,
Its N pole then colelctor electrode with audion VT3 is connected.The N pole of diode D2 and the positive pole of electric capacity C1
Be connected, its P pole then colelctor electrode with audion VT2 is connected.Resistance R2 is serially connected in diode D2's
Between the N pole of N pole and diode D3.
The IN pin of described three-terminal voltage-stabilizing chip U2 is then connected with the N pole of diode D2.Described three poles
The base stage of pipe VT1 is connected with the positive pole of electric capacity C1, its colelctor electrode then base stage with audion VT2 is connected
Connect.The GND pin of described control chip U3 is connected with the N pole of diode D1.Described diode D1
N pole CONT pin with control chip U3 after resistance R4 be connected；Described audion VT3's
Colelctor electrode is connected with the N pole of diode D4 and the positive pole of electric capacity C4 the most respectively.
Described on-off circuit is made up of bidirectional thyristor D5, resistance R5, resistance R6 and electric capacity C5.Even
When connecing, resistance R5 is serially connected between control pole and the OUT pin of control chip U3 of bidirectional thyristor D5.
The positive pole of electric capacity C5 is connected with the second plate of bidirectional thyristor D5, its negative pole is then with diode D1's
N pole be connected while ground connection.One end of resistance R6 is connected with the first anode of bidirectional thyristor D5,
Its other end then Same Name of Ends with the former limit inductance coil of transformator T is connected.LED then with resistance R6 phase
In parallel.
As in figure 2 it is shown, this ripple voltage eliminates electricity routing amplifier P1, amplifier P2, audion VT4,
Resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, diode D6, electricity
Hold C6, electric capacity C7, electric capacity C8 and electric capacity C9 composition.
During connection, the negative pole of electric capacity C6 is connected with the positive pole of electric capacity C8, its positive pole is then electric as this ripple
Pressure eliminates the input of circuit and is connected with the N pole of diode D4.The negative pole of described electric capacity C8 then with put
The negative pole of big device P2 is connected.One end of resistance R7 negative pole with amplifier P1 after resistance R9 is connected,
Its other end then positive pole with electric capacity C6 is connected.The positive pole of electric capacity C7 and resistance R7 and the company of resistance R9
Contact is connected, its negative pole negative pole with electric capacity C6 after resistance R8 is connected.The N pole of diode D6
Be connected with the negative pole of electric capacity C7, its P pole then positive pole with amplifier P2 is connected.Electric capacity C9 is just
Pole is connected with the negative pole of amplifier P1, its negative pole then negative pole with amplifier P2 is connected.Resistance R10
It is serially connected between positive pole and the outfan of amplifier P1.Resistance R11 is serially connected in the positive pole of amplifier P2 and defeated
Go out between end.Resistance R12 is serially connected between the outfan of amplifier P1 and the colelctor electrode of audion VT4.
Meanwhile, the minus earth of described amplifier P2, its outfan then base stage with audion VT4 is connected.
The grounded emitter of described audion VT4；The outfan of described amplifier P1 eliminates electricity as this ripple voltage
The outfan on road is also connected with the TRIG pin of control chip U3.
During work, the present invention cuts off the electricity supply when line voltage exceedes higher limit and makes LED not work, and works as electrical network
Voltage recloses power supply when recovering normal makes LED again light, such that it is able to protection LED is not by overvoltage
Damage.The present invention uses the integrated chip of NE555 and corresponding peripheral circuit to combine, and make use of cleverly
The switching function of transistor, makes present invention sensitivity enhancement 30% compared with traditional overvoltage protective system,
Such that it is able to effectively LED is carried out overvoltage protection.Meanwhile, remaining ripple voltage can be entered by the present invention
Row eliminates, thus improves the stability of the present invention, it is to avoid the present invention produces misoperation.
As it has been described above, just can well realize the present invention.
Claims (6)
1. a LED mains supply over-voltage based on ripple elimination circuit protects system, it is characterised in that main
Will be by transformator T, control chip U3, three-terminal voltage-stabilizing chip U2, with the OUT pin of control chip U3
The on-off circuit being connected, is serially connected in the resistance between CONT pin and the on-off circuit of control chip U3
R4, the current rectifying and wave filtering circuit being connected with transformator T-phase, the triggering circuit being connected with current rectifying and wave filtering circuit,
The ripple voltage being connected with the TRIG pin of control chip U3 eliminates circuit, and P pole is connected with triggering circuit
Connect, N pole then eliminates the diode D4 that circuit is connected with ripple voltage, and positive pole is with audion VT3's
The electric capacity C4 that colelctor electrode is connected, negative pole is connected with the THRE pin of control chip U3 after resistance R3
Composition；Circuit is connected the IN pin of described three-terminal voltage-stabilizing chip U2, its OUT pin is then distinguished with triggering
Be connected with RE pin and the VCC pin of control chip U3, its GND pin ground connection.
A kind of LED mains supply over-voltage based on ripple elimination circuit the most according to claim 1 is protected
System, it is characterised in that described ripple voltage eliminates electricity routing amplifier P1, amplifier P2, audion
VT4, negative pole negative pole with amplifier P2 after electric capacity C8 is connected, positive pole then disappears as this ripple voltage
Except the electric capacity C6 of the input of circuit, one end negative pole with amplifier P1 after resistance R9 is connected, another
The resistance R7 that end then positive pole with electric capacity C6 is connected, the junction point phase of positive pole and resistance R7 and resistance R9
Connect, electric capacity C7, N pole that negative pole negative pole with electric capacity C6 after resistance R8 is connected is with electric capacity C7's
The diode D6 that negative pole is connected, P pole then positive pole with amplifier P2 is connected, positive pole and amplifier P1
The electric capacity C9 that negative pole is connected, negative pole then negative pole with amplifier P2 is connected, be serially connected in amplifier P1
Positive pole and outfan between resistance R10, be serially connected in the resistance between positive pole and the outfan of amplifier P2
R11, and the resistance R12 group being serially connected between the outfan of amplifier P1 and the colelctor electrode of audion VT4
Become；The minus earth of described amplifier P2, its outfan then base stage with audion VT4 is connected；Described
The grounded emitter of audion VT4；The outfan of described amplifier P1 eliminates circuit as this ripple voltage
Outfan is also connected with the TRIG pin of control chip U3；Described ripple voltage eliminates the input of circuit
Then it is connected with the N pole of diode D4.
A kind of LED mains supply over-voltage based on ripple elimination circuit the most according to claim 2 is protected
System, it is characterised in that described current rectifying and wave filtering circuit is made up of diode rectifier U1 and electric capacity C1；Institute
The negative pole of the cathode output end and electric capacity C1 of stating diode rectifier U1 is connected, its cathode output end then with
The positive pole of electric capacity C1 is connected；The input of described diode rectifier U1 is then electric with the secondary of transformator T
The Same Name of Ends of sense coil is connected with non-same polarity, its cathode output end also with the former limit inductor wire of transformator T
The non-same polarity of circle is connected；The positive pole of described electric capacity C1 is all connected with triggering circuit with negative pole.
A kind of LED mains supply over-voltage based on ripple elimination circuit the most according to claim 3 is protected
System, it is characterised in that described triggering circuit by audion VT1, audion VT2, audion VT3,
The diode that N pole is connected with the negative pole of electric capacity C1, P pole then emitter stage with audion VT1 is connected
D1, positive pole is connected with the emitter stage of audion VT1, negative pole then base stage with audion VT3 is connected
Electric capacity C2, the resistance R1 being serially connected between the emitter stage of audion VT2 and the base stage of audion VT3, just
The electric capacity C3 that pole is connected with the emitter stage of audion VT3, negative pole is then connected with the N pole of diode D1,
P pole is connected with the colelctor electrode of audion VT2, N pole then colelctor electrode with audion VT3 is connected two
Pole pipe D3, N pole is connected with the positive pole of electric capacity C1, P pole then colelctor electrode with audion VT2 is connected
Diode D2, and the resistance R2 being serially connected between the N pole of diode D2 and the N pole of diode D3
Composition；The IN pin of described three-terminal voltage-stabilizing chip U2 is then connected with the N pole of diode D2；Described three
The base stage of pole pipe VT1 is connected with the positive pole of electric capacity C1, its colelctor electrode then with the base stage phase of audion VT2
Connect；The GND pin of described control chip U3 is connected with the N pole of diode D1；Described diode
The N pole of D1 CONT pin with control chip U3 after resistance R4 is connected；Described audion VT3
Colelctor electrode be connected with the N pole of diode D4 and the positive pole of electric capacity C4 the most respectively.
A kind of LED mains supply over-voltage based on ripple elimination circuit the most according to claim 4 is protected
System, it is characterised in that described on-off circuit, by bidirectional thyristor D5, is serially connected in bidirectional thyristor D5's
Control the resistance R5 between pole and the OUT pin of control chip U3, the of positive pole and bidirectional thyristor D5
The electric capacity C5 of ground connection while two anodes are connected, negative pole is then connected with the N pole of diode D1, and
One end is connected with the first anode of bidirectional thyristor D5, the other end then with the former limit inductance coil of transformator T
Same Name of Ends be connected resistance R6 composition.
A kind of LED mains supply over-voltage based on ripple elimination circuit the most according to claim 5 is protected
System, it is characterised in that described control chip U3 is the integrated chip of NE555, three-terminal voltage-stabilizing chip U2 is
7815 integrated chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610430392.4A CN105979637A (en) | 2016-06-14 | 2016-06-14 | Corrugation canceling circuit based city power overvoltage protection system for LEDs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610430392.4A CN105979637A (en) | 2016-06-14 | 2016-06-14 | Corrugation canceling circuit based city power overvoltage protection system for LEDs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105979637A true CN105979637A (en) | 2016-09-28 |
Family
ID=57022259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610430392.4A Pending CN105979637A (en) | 2016-06-14 | 2016-06-14 | Corrugation canceling circuit based city power overvoltage protection system for LEDs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105979637A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106714388A (en) * | 2017-02-09 | 2017-05-24 | 中山自信照明科技有限公司 | LED (Light Emitting Diode) illumination circuit |
-
2016
- 2016-06-14 CN CN201610430392.4A patent/CN105979637A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106714388A (en) * | 2017-02-09 | 2017-05-24 | 中山自信照明科技有限公司 | LED (Light Emitting Diode) illumination circuit |
| CN106714388B (en) * | 2017-02-09 | 2018-06-26 | 中山自信照明科技有限公司 | LED illumination circuit |
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Application publication date: 20160928 |